Theme Styles define visual themes in APEX:

A. When the Is Public attribute is enabled: Setting "Is Public" to "Yes" in Shared Components > Theme Styles allows runtime selection (e.g., via a dropdown in the app UI), letting users switch between styles (e.g., "Vita" to "Vita - Dark").

B. Control layout: False; layout is managed by templates and regions; Theme Styles handle colors, fonts, etc.

Plugins extend APEX’s functionality beyond built-in components:

C. Process: A Process plugin executes custom server-side logic (e.g., PL/SQL) during page processing or AJAX calls. Example: A plugin to sync data with an external API after form submission. It’s defined with execution points and parameters.

D. Region: A Region plugin creates custom UI areas (e.g., a dynamic chart or carousel). Example: A plugin rendering a custom dashboard. It supports attributes, templates, and refresh events.

A. Validation: While validations are customizable, they’re not a plugin type; they’re declarative or PL/SQL-based within APEX.

The requirement is to allow users to pick a single employee (name and ID) from a list tied to the MANAGER_ID column in the EMPLOYEES table, implying a dynamic, searchable selection:

A. Popup LOV: This item type displays a popup window with a searchable list of values, sourced from a SQL query (e.g., SELECT ename, empno FROM employees WHERE empno IN (SELECT DISTINCT manager_id FROM employees)). It returns a single value (e.g., EMPNO) while displaying the name, perfectly meeting the need for a single selection from a related dataset.

B. Switch: A toggle (Yes/No), unsuitable for selecting from a list of employees.

Page Designer’s layout modes under Utilities adjust the workspace:

A. Two Pane: Splits into two vertical sections (e.g., tree and properties), ideal for focusedediting.

B. Three Pane: Adds a third section (e.g., tree, grid, properties), offering a balanced view for complex pages.

C. Four Pane: Not available; APEX limits to three for usability.

Regenerating Push Notification credentials updates the VAPID keys (public/private pair) in the PWA settings:

A. Existing Push Subscriptions invalidated: Subscriptions (in APEX_APPL_PUSH_SUBSCRIPTIONS) are tied to the old keys. New keys break this link, requiring users to re-subscribe (e.g., via browser prompts), as the push service (e.g., Firebase) can’t authenticate old subscriptions.

B. New notification server: False; the server configuration remains; only credentials change.

The Universal Theme (Theme 42) provides pre-built components:

A. Calendar: A region type for date-based displays (e.g., events), styled with Universal Theme templates (e.g., FullCalendar integration).

B. Comments: A region type for user feedback or notes, with built-in styling and moderation options.

C. Badge: A UI component for displaying counts or statuses (e.g., "5 New"), often in navigation or lists, styled via CSS classes.

Authorization Schemes in APEX can be evaluated at:

Once per page view: Checks authorization each time a page is rendered.